Pneumatic circuit for controlling the feeding of yarn into a yarn magazine

ABSTRACT

A pneumatic system for the control of the feeding of yarn into a magazine in textile machines, such as yarn-winding machines. The system functions exclusively by the use of pneumatic power; in one disclosed embodiment yarn fed from a source of supply by driven feed rollers passes under tension to a yarn magazine, and thence from the magazine to a yarn-winding device. Pneumatic sensors are provided for detecting (1) a failure of tension in the yarn between the feeding rollers and the magazine, and (2) the condition wherein the magazine is full of yarn. Pneumologic means, into which impulses from the two sensors are directed, controls a pneumatic power means for stopping the feeding of yarn by the feeding rollers upon the presence of either one or both conditions (1) and (2). In another disclosed embodiment, the pneumatic power means is under the control of only a pneumatic sensor which detects a failure of tension in the yarn between the feeding rollers and the magazine.

United States Patent Sedlarik et a1.

[is] 3,640,44fi

[ Feb. 8, 1972 [54] PNEUMATIC CIRCUIT FOR CONTROLLING THE FEEDING OF YARN INTO A YARN MAGAZINE [72] Inventors: Jaroslav Sedlarik; Jiri Havllas; Premysl Kostelecky, all of Liberec, Czechoslovakia [73] Assignee: Elitex, Zavody textilriho strojirenstvi, Liberec, Czechoslovakia 22 Filed: Apr. 17, mo

21 Appl.No.: 29,539

[30] Foreign Application Priority Data Apr. 25, 1969 Czechoslovakia ..2933-69 [56] References Cited UNITED STATES PATENTS 3,312,381 4/1967 Guttler ..l9/l59R 3,409,237 11/1968 Pospisil ..242/37R 3,460,729 8/1969 Treff ..226/44X Primary Examiner-Richard A. Schacher AttorneyArthur O. Klein [57] ABSCT A pneumatic system for the control of the feeding of yarn into a magazine in textile machines, such as yarn-winding machines. The system functions exclusively by the use of pneumatic power; in one disclosed embodiment yarn fed from a source of supply by driven feed rollers passes under tension to a yarn magazine, and thence from the magazine to a yarnwinding device. Pneumatic sensors are provided for detecting l) a failure of tension in the yarn between the feeding rollers and the magazine, and (2) the condition wherein the magazine is full of yarn. Pneumologic means, into which impulses from the two sensors are directed, controls a pneumatic power means for stopping the feeding of yarn by the feeding rollers upon the presence of either one or both conditions (1) and In another disclosed embodiment, the pneumatic power means is under the control of only a pneumatic sensor which detects a failure of tension in the yarn between the feeding rollers and the magazine.

10 Claims, 5 Drawing Figures PNEUMATIC CIRCUIT FOR CONTROLLING THE FEEDING 01F YARN INTO A YARN MAGAZINE The present invention relates to pneumatic systems for the control of the feeding of yarn into a magazine in textile machines, particularly yam-winding machines for continuous yarn winding. The pneumatic circuit according to the present invention can also be used in other rewinding machines, e.g., warping machines, as well as in textile machines requiring control of yarn feeding in dependence upon yarn tension.

Winding machines hitherto known use devices for controlling their separate mechanisms which act on the base of either electric or pneumatic power. The said machines particularly use scanners emitting electric signals which controi, through an electropneumatic transformer, a power unit which makes a corresponding change in the mechanism as the result of the control action. One such prior system is disclosed and claimed in our prior US. application Ser. No. 2,571, filed Jan. 13, 1970. Such prior application is incorporated herein by reference in its entirety. This electropneumatic control hitherto used increases the need of attendance and maintenance of the device, and increases the number of parts of the control circuit.

The present invention has for its object the substantial removal of the said disadvantages by constituting a control circuit, acting exclusively on the principle of using pneumatic power, this being simpler and less expensive from the manufacturing viewpoint.

In apparatus according to the present invention, at least one pneumatic sensor and at least one power unit are attached to a pneumologic element, the solid pneumologic element being connected to a pressure fluid source.

Further advantages and features of the present invention are described in the following description and shown in the accompanying drawings of preferred embodiments of the present invention, of which Hg. 1 is a schematic view of a first embodiment of the control system including the device to be controlled; such device includes a yarn magazine in a winding machine, a mechanism for feeding yam into said yarn magazine, and a winding mechanism withdrawing said yarn from said magazine;

FIG. 2 is a schematic diagram of a first embodiment of the pneumatic circuit according to the present invention for controlling the feeding of yarn into the yarn magazine in dependence upon both the yarn tension in advance of the magazine and the level of filling of the magazine, the yarn-controlling power unit being shown in its normal position;

FIG. 3 is a schematic diagram of a second embodiment of the pneumatic circuit according to the present invention for controlling the feeding of yarn into the yarn magazine in dependence upon the yarn tension in advance of the magazine; and

FIGS. 4 and 5 are schematic diagrams of third and fourth embodiments, respectively, of the pneumatic circuit according to the present invention, such embodiments employing simple controls of the power unit.

Referring now to FIGS. 1 and 2, yarn is withdrawn by means of feeding rollers 2, 3 from the supply, tag, a cop 4, passing thereupon through yarn brake 5 and guiding eyelet 61 of a pneumatic power unit 6. The section of yarn 1 between the feeding rollers 2, 3 and the magazine 7 is conveyed through a pneumatic sensor 8 by a pneumatic injector 9 (FIG. 1 As the feeding rollers 2, 3 feed yarn 1 at a speed from 10 to percent higher than the speed of withdrawal of yarn 1 by the cheese 10 being wound, the magazine 7 is gradually filled. Upon being filled completely, the yarn filling 11 in magazine 7 begins to press against a flap 121 which closes nozzle 122; air under pressure is fed through a venturi choke 123 in the direction R from a pressure fluid source, (not shown). The flap 121, the nozzle 122, and the choke 123 constitute a pneumatic sensor 12 (FIGS. 1 and 2) which is connected by pipelines 13 and 15, which include chokes 123 and 83, respectively, to the pneumologic element 14. Further pipelines 16, disposed close to and in parallel with pipelines 13 and 15, connect the conduit from the source of pressure to element 14. Finally, a pair of pipelines 16, disposed in advance of and after the sensors 8 and 12, connect the conduit from the source of pressure to pneumologic element 14.

From the yarn magazine 7, yarn 1 is withdrawn through guide 17 and brake 18, through another guide 19 to the winding drum 20, rotating in the direction P, and is wound onto the winding bobbin 10. A pneumatic power unit 6 is attached to the pneumologic element 14 (FIGS. 2, 3), said power unit selectively disengaging said yam 1 from the feeding rollers 2, 3 by pulling the yarn from between such rollers in a direction axially thereof. A plurality of power units 6 connected in parallel and controlled by a single control device 8, 12, 14 may be employed where a plurality of yams 1 are being wound under the control of a single yarn.

In FIGS. 1 and 2 the power unit 6 is connected to the pneumologic element 14 by two pipelines 21, 22. The pneumologic element 14 transforms the signals of the pneumatic sensors 8, 12 and emits impulses into the power unit 6. The specific construction of the pneumologic element is not shown, since such pneumologic elements are well known and a number of pneumologic elements of different construction can be used. The main condition is that the signals must be evaluated in the same manner.

The pneumatic sensor 8 is constructed generally similarly to pneumatic sensor 12. It includes, in the same manner as sensor 12, a flap 81, a nozzle 82, and a venturi forming choke 83, and works in the same manner as the sensor 12 mounted at the exit of the magazine 7. When the yarn 1 which engages sensor 8 is under tension, the nozzle 82 of sensor 8 is closed.

The power unit 6 (FIG. 2) consists of a guiding eyelet 61 acting immediately upon yam l, of pneumatically impermeable bellows 62, 63 or resilient material, e.g., sheet plastics, a housing 64, and a coil tension return spring 65 when the guiding eyelet 61 is in it normal position, with the yarn 1 exerting tension on sensor 8 and the yarn magazine 7 not filled, it is disposed as shown in FIG. 2, with bellows 63 inflated to overcome spring 65 and bellows 62 deflated.

When bellows 63 is deflated and bellows 62 inflated, the guide eyelet 61 is swung to the right (P16. 2) whereby to withdraw yarn 1 axially from between rollers 2 and 3.

The letter A denotes an inlet pressure pipe which selectively carries a signal which disturbs the function of the control system and causes an adjustment of the power unit 6 in such manner that eyelet 61 swings to the right to pull the yarn 1 out of engagement with the feeding rollers 2, 3.

The device shown in FIGS. 1 and 2 and described above works as follows:

Pressure air is fed in the direction R from a source of fluid (air) pressure (not shown). During the filling of magazine 7 with yarn, nozzle 122 of sensor 12 mounted behind the magazine 7, remains open (FIG 2). That means that the pneumologic element 14 does not then get any pressure impulse from sensor 12. Since yarn 1 subjects sensor 8 to pressure, nozzle 82 of sensor 8 is closed, and thus the pneumologic element 14 obtains a pressure impulse from said sensor 8. After being transformed in the pneumologic element 14, the impulse from sensor 8 is guided through pipe 21 into the bellows 63 of power unit 6, the guiding eyelet 61 thus holding yarn 1 in engagement between the feeding rollers 2, 3 which rotate in the direction S. upon the filling of magazine 7, nozzle 122 is closed, sensor 12 transmits an impulse to pneumologic element 14, and the impulses from the sensors 8 and 12 are evaluated in the pneumologic element 14 in such manner, that a pulse is emitted into bellows 62 of power unit 6 and simultaneously, the pressure pulse into bellows 63 is cancelled. The guiding eyelet 61 is thus swung to the other side (clockwise, FIG. 2), and yarn 1 is pulled out of engagement with feeding rollers 2, 3.

From the above it can be seen that either a filling of the magazine 7 of a drop of yarn tension will cause an interruption of the feeding of yarn 1; such feeding is resumed after normal yarn tension is restored and after a partial emptying of magazine 7. For the interruption of the feeding of yarn 1, only one of said actions is sufficient, that is, either the filling of magazine 7 of a yarn tension drop. When both actions occur simultaneously, the feeding of yarn 1 will also be interrupted.

As above indicated, FIGS. 3, 4 and 5 illustrates second, third and fourth embodiments, respectively, of the pneumatic circuit in accordance with the invention. Parts in FIGS. 3, 4 and 5 which are similar to those in FIGS. 1 and 2 are designated by the same reference characters as in FIGS. 1 and 2.

The embodiment of FIG. 3 differs from that of FIG. 2 by the omission in FIG. 3 of the right-hand pipeline 16, pipeline 13, choke 123, nozzle 123, and flap 121 of FIG. 2. In the embodiment of FIG. 3 the pneumatic power unit 6 is therefore responsive to only the tension of yarn l as detected by pneumatic sensor 8.

In the embodiment of FIG. 3, the feeding of yarn l is controlled only according to yarn tension. Such yarn tension depends also from the degree of filling the magazine 7. When magazine 7 is filled, the injector must overcome a considerable resistance, this causing the yarn l to be tensioned to a lesser degree.

The return spring 65 interrupts the yarn feeding into the magazine 7 in case of failure of the pneumatic system.

In the embodiment of FIG. 4, the sensors 8 and 12 of FIG. 2 are retained. However, one of the pipelines 16' of FIG. 2 is dispensed with, as well as the pipeline 16 of FIG. 2 which is disposed close and parallel to pipeline 15. Such different con nection is made necessary by the fact that in FIG. 4 only one bellows, that designated 63, is employed in the pneumatic power unit, there designated 6'. In unit 6 there are employed adjustable opposed abutment screws 66 and 67 for limiting the swinging motion of guiding eyelet 61. It will be seen that the return spring 65 replaces the bellows 62 of FIG. 2, thus pulling yarn 1 from between rollers 2 and 3 when bellows 63 is deflated.

In the embodiment of FIG. 5, the portion of the apparatus including pneumologic element 14, sensor 8 and 12, etc., is the same as in FIG. 4. In the power unit 6", however, the bellows 62 of FIG. 2 is retained, and the bellows 63 is dispensed with. The return spring 65 thus replaces bellows 63 and effects the engagement of yarn l with the feeding rollers 2, 3 when bellows 62 is deflated.

Although our invention has been illustrated and described with reference to the preferred embodiments thereof, we wish to have it understood that it is in no way limited to the details of such embodiments but is capable of numerous modifications within the scope of the appended claims.

What is claimed is:

1. Apparatus for automatically controlling the feeding of yarn into a yarn magazine in a textile machine to permit the uninterrupted operation of the machine, comprising means for feeding the yarn into the magazine, a fluid pressure sensor for detecting changes in tension in the yarn between the feeding means and the magazine, and fluid pressure power means responsive to the sensor for interrupting the feeding of the yarn into the magazine when the yarn tension at the sensor falls below a predetermined value.

2. Apparatus according to claim 1, comprising a fluid pressure logic element interposed between the sensor and the power means, and a fluid pressure source connected to the fluid pressure element.

3. Apparatus according to claim 2, wherein the pressure fluid employed is a gas.

5. Apparatus according to claim 1, comprising a second fluid pressure sensor for detecting the degree of filling of the magazine, and means connecting the second sensor to the fluid pressure power means, whereby the feeding of the yarn into the magazine is interrupted when the magazine contains a predetermined amount of yarn.

4. Apparatus according to claim 2, wherein the fluid pressure sensor includes a flap attached to a nozzle supplied with pressure fluid through aconduit connected to the fluid pressure source, and comprising means providing a ventun constriction in the conduit in advance of the nozzle.

6. Apparatus according to claim 1, wherein the means for feeding yarn into the magazine comprises a means for pulling the yarn from a source of supply and a means for charging the thus fed yarn into the magazine, and wherein the means responsive to the sensor selectively interrupts the feeding of the yarn by the means which pulls it from the source of supply.

7. Apparatus according to claim 6, wherein the means for charging the yarn into the magazine is impositive in its action and remains operative to tension the yarn extending to it despite the interruption of the action of the yam-pulling means.

8. Apparatus according to claim 6, wherein the yarn-pulling means comprises. opposed driven yarn-pressing means, and the fluid pressure power means responsive to the sensor selectively interrupts the operative engagement of the yarn by said driven yarn-pressing means.

9. Apparatus according to claim 8, wherein the fluid pressure power means responsive to the sensor selectively removes the yarn from between the driven yarn-pressing means.

10. Apparatus according to claim 1, wherein the fluid pressure power means comprises at least one fluid impermeable hollow body of variable volume adapted to be selectively inflated with fluid under pressure. 

1. Apparatus for automatically controlling the feeding of yarn into a yarn magazine in a textile machine to permit the uninterrupted operation of the machine, comprising means for feeding the yarn into the magazine, a fluid pressure sensor for detecting changes in tension in the yarn between the feeding means and the magazine, and fluid pressure power means responsive to the sensor for interrupting the feeding of the yarn into the magazine when the yarn tension at the sensor falls below a predetermined value.
 2. Apparatus according to claim 1, comprising a fluid pressure logic element interposed between the sensor and the power means, and a fluid pressure source connected to the fluid pressure element.
 3. Apparatus according to claim 2, wherein the pressure fluid employed is a gas.
 4. Apparatus according to claim 2, wherein the fluid pressure sensor includes a flap attached to a nozzle supplied with pressure fluid through a conduit connected to the fluid pressure source, and comprising means providing a venturi constriction in the conduit in advance of the nozzle.
 5. Apparatus according to claim 1, comprising a second fluid pressure sensor for detecting the degree of filling of the magazine, and means connecting the second sensor to the fluid pressure power means, whereby the feeding of the yarn into the magazine is interrupted when the magazine contains a predetermined amount of yarn.
 6. Apparatus according to claim 1, wherein the means for feeding yarn into the magazine comprises a means for pulling the yarn from a source of supply and a means for charging the thus fed yarn into the magazine, and wherein the means responsive to the sensor selectively interrupts the feeding of the yarn by the means which pulls it from the source of supply.
 7. Apparatus according to claim 6, wherein the means for charging the yarn into the magazine is impositive in its action and remains operative to tension the yarn extending to it despite the interruption of the action of the yarn-pulling means.
 8. Apparatus according to claim 6, wherein the yarn-pulling means comprises opposed driven yarn-pressing means, and the fluid pressure power means responsive to the sensor selectively interrupts the operative engagement of the yarn by said driven yarn-pressing means.
 9. Apparatus according to claim 8, wherein the fluid pressure power means responsive to the sensor selectively removes the yarn from between the driven yarn-pressing means.
 10. Apparatus according to claim 1, wherein the fluid pressure power means comprises at least one fluid impermeable hollow body of variable volume adapted to be selectively inflated with fluid under pressure. 